The Cr₂O₃ with high‐energy density and relatively low lithium insertion potential is a promising anode candidate for LIBs. However, the intrinsic poor electroconductivity and side effects like volume expansion of Cr₂O₃ severely limit its capacity and cyclability at high charge/discharge rates. To address the problem, the amorphous Cr₂O₃/N‐doped carbon nanosheets (denoted as a‐Cr₂O₃/NC) have been designed and prepared by an easy one‐step solution combustion synthesis method from a uniform solution of chromium nitrate, glucose, and glycine. The as‐synthesized a‐Cr₂O₃/NC consist of amorphous Cr₂O₃ particles and N‐doped carbon sheet, where the amorphous Cr₂O₃ is evenly encapsulated in the carbon sheet support. An anode prepared from the synthesized a‐Cr₂O₃/NC demonstrates much higher specific capacity and better cycling performance than the crystalline Cr₂O₃ anode. Upon extended cycling, the a‐Cr₂O₃/NC anode exhibits good long‐term stability and its reversible capacity retains as high as 782.4 mAh g⁻¹ after 500 cycles at 1 A g⁻¹. Such good performance stems from its unique structure. The amorphous structure of Cr₂O₃ can furnish a mass of enterable active sites which can favor the lithium ions insertion/extraction, whereas the sheet‐like N‐doped carbon support can increase the electroconductivity and facilitate the transportation of lithium ions and electrons.

中文翻译：

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非晶态Cr2O3 / N掺杂碳纳米片的简便合成及其优异的储锂性能

具有高能量密度和较低锂插入电位的Cr ₂ O ₃是有前途的LIB阳极候选材料。然而，固有的差的导电性和诸如Cr ₂ O _3的体积膨胀之类的副作用严重限制了其在高充电/放电速率下的容量和可循环性。为了解决该问题，所述无定形的Cr ₂ ö ₃ / N掺杂的碳纳米片（表示为一个-Cr ₂ ö ₃ / NC）已经从铬的均匀溶液设计并制备通过简单的一步法溶液燃烧合成法硝酸盐，葡萄糖和甘氨酸。合成的a - Cr ₂O ₃ / NC由无定形Cr ₂ O ₃颗粒和N掺杂碳片组成，其中无定形Cr ₂ O ₃被均匀地封装在碳片载体中。由合成的Cr ₂ O ₃ / NC制备的阳极比结晶的Cr ₂ O ₃阳极具有更高的比容量和更好的循环性能。在延长的循环中，a- Cr ₂ O ₃ / NC阳极表现出良好的长期稳定性，在1 A g下经过500次循环后，其可逆容量保持高达782.4 mAh g ^-1-1。如此出色的性能源于其独特的结构。Cr ₂ O ₃的无定形结构可以提供大量可进入的活性位，这有利于锂离子的插入/萃取，而片状N掺杂碳载体可以提高电导率并促进锂离子和电子的传输。